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The Caleffi 521609A is a three-way thermostatic mixing valve designed for 1 inch sweat connections. It features a low-lead brass construction, providing reliable performance in domestic hot water and hydronic systems.
This valve ensures precise temperature control and stable water output in demanding conditions.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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